Charging power distribution method and vehicle-mounted charging system

Abstract

The invention discloses a charging power distribution method and a vehicle-mounted charging system in the technical field of vehicle charging, and aims to solve the technical problem that safety and stability need to be overcome when electric engineering machinery needs to realize on-load charging. The method comprises the following steps: correspondingly adjusting distribution of charging power according to different electric quantity state values of a battery, and charging the battery on the premise of ensuring stable operation of a motor; the first power value and the second power value which are different in power size are obtained from the historical power data, the distribution of the charging power is specifically controlled through the first power value and the second power value, and the adaptability of the charging power distribution strategy and the actual power requirement of the motor under current work is improved; therefore, the requirement of on-load charging of the engineering machinery is met on the premise of operation safety and stability.

Description

Technical Field

[0001] The invention relates to a charging power distribution method and a vehicle-mounted charging system, and belongs to the technical field of vehicle charging. Background Art

[0002] Electric construction machinery, represented by electric excavators, is gradually replacing fossil-powered construction machinery due to its low noise and low pollution. However, unlike electric passenger cars, electric construction machinery consumes a lot of power and needs to be charged after working for a period of time. During the charging period, for the safety and stability of the entire vehicle, the motor needs to stop working and unplug the charger after charging before continuing to work. Since the input power demand of the motor is in a fluctuating state, charging while working will affect the safety and stability of the motor and the entire power supply system. Therefore, it is difficult for electric construction machinery to achieve on-load charging.

[0003] In summary, electric construction machinery needs to overcome the difficulties of safety and stability in order to achieve on-load charging. Summary of the invention

[0004] The purpose of this application is to overcome the deficiencies in the prior art and to provide a charging power distribution method and an on-board charging system for realizing on-load charging of electric engineering machinery under the premise of meeting the safety and stability of electricity use.

[0005] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: In a first aspect, the present application provides a charging power allocation method, comprising: Acquire historical power data of the motor, and extract a first power value and a second power value lower than the first power value from the historical power data; Get the battery power status value in real time; In response to the state of charge value being less than a first threshold, canceling the power supply of the battery to the motor, allocating a first power value from the charging power to power the motor, and allocating the remaining power to the battery for charging; In response to the power state value reaching a first threshold, a second power value is allocated from the charging power to power the motor, and the remaining power is allocated to the battery for charging; the battery is also controlled to power the motor to supplement the power fluctuation difference.

[0006] In some embodiments of the first aspect, acquiring historical power data of the motor includes: The torque and speed of the motor are obtained, and a reference power value is calculated according to the following formula: , In the formula, is the reference power value, is the torque, is the rotation speed; The reference power value of at least one working cycle is continuously recorded as historical power data.

[0007] The reference power value of at least one working cycle is continuously recorded as historical power data.

[0008] In some embodiments of the first aspect, the first power value is peak power, and the second power value is average power.

[0009] In some embodiments of the first aspect, the first threshold is 20%.

[0010] In a second aspect, the present application provides a vehicle-mounted charging system, including a vehicle controller, which is used to execute the charging power allocation method described in any embodiment of the first aspect.

[0011] In some embodiments of the second aspect, further comprising: Motors and batteries; A power distribution switch, electrically connected to the vehicle controller, and also electrically connected to a power source, the motor and the battery; A battery management device, connected to the vehicle controller by electrical signals; The vehicle controller adjusts the charging power distribution to the motor and the battery through the power distribution switch, and also adjusts the charging and discharging of the battery through the battery management device.

[0012] In some embodiments of the second aspect, the power source is an on-board charger, which is electrically connected to the power distribution switch, and is used to rectify external alternating current into direct current to supply the power distribution switch.

[0013] In some embodiments of the second aspect, a motor controller is further included, wherein the motor controller is electrically connected to the power distribution switch and the motor, respectively, and the motor controller is electrically connected to the control device and the vehicle controller, respectively; the motor controller controls the actual input power of the motor according to the charging power distribution strategy of the vehicle controller and the control instructions of the control device.

[0014] In a third aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the charging power allocation method described in any embodiment of the first aspect.

[0015] In a fourth aspect, the present application also provides a computer program product, including a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the charging power allocation method described in any embodiment of the first aspect are implemented.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The charging power distribution method and vehicle-mounted charging system provided in the present application adjust the distribution of charging power accordingly according to the different power state values ​​of the battery, thereby ensuring that the battery is charged under the premise of stable operation of the motor; and obtain a first power value and a second power value of different power sizes from historical power data, and use the first power value and the second power value to specifically control the reasonable distribution of charging power, thereby improving the adaptability of the charging power distribution strategy and the actual power demand of the motor under current operation, thereby meeting the needs of on-load charging of construction machinery under the premise of operation safety and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 is a flowchart of the steps of the charging power allocation method provided in this embodiment; Figure 2 is a schematic structural diagram of the vehicle-mounted charging system provided in this embodiment when it is in an on-load charging state; Figure 3 is a structural schematic diagram of the vehicle charging system provided in this embodiment when it is in a pure charging state; Figure 4 is a structural schematic diagram of the vehicle charging system provided in this embodiment when it is in a shutdown state; In the figure: 1. Vehicle controller; 2. Motor; 3. Battery; 4. On-board charger; 5. Power distribution switch; 6. Battery management device; 7. Motor controller. DETAILED DESCRIPTION

[0019] It should be noted that on-load charging refers to the process of charging when the power output end is connected to a certain load, that is, the construction machinery works while charging.

[0020] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0021] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship. Embodiment 1

[0022] Figure 1 This is a flow chart of a charging power distribution method in the first embodiment of the present invention. This flow chart only shows the logical sequence of the method described in this embodiment. In other possible embodiments of the present invention, different Figure 1 The steps shown or described are accomplished in the order shown.

[0023] See also Figure 1 The method of this implementation specifically includes the following steps: The historical power data of the motor 2 is obtained. Since the power distribution frequency of the power distribution switch 5 is generally low, the historical power data has an important reference value for the subsequent charging power distribution. A first power value and a second power value lower than the first power value are extracted from the historical power data. The first power value and the second power value are respectively used for power distribution for on-load charging under different states of the battery 3.

[0024] The power state value of the battery 3 is obtained in real time; in response to the power state value being less than the first threshold value, it indicates that the power state value is low, so the power supply of the battery 3 to the motor 2 is cancelled, the safety and stability of the battery 3 is protected, and the rapid decline in the life of the battery 3 and the rapid decline in the power supply capacity are prevented; at the same time, the first power value is allocated from the charging power to power the motor 2 until the power state value of the motor 2 returns to a stable level or the battery 3 is manually controlled to power the motor 2 again, and the remaining power is allocated to the battery 3 for charging during this process. Since the first power value is higher than the second power value, the power distribution frequency of the power distribution switch 5 is generally low, and when the battery 3 does not participate in the process of powering the motor 2, the power supply demand of the motor 2 is met in most cases.

[0025] In response to the power status value reaching the first threshold, indicating that the battery 3 is in good condition, a second power value is allocated from the charging power to power the motor 2, and the remaining power is allocated to the battery 3 for charging. The second power value is lower than the first power value. Under this allocation strategy, the charging speed of the battery 3 can be accelerated, and the load charging mode can be gotten rid of as soon as possible; although the second power value can also power the motor 2, due to the various action instructions output by the control device and the changes in the working conditions, the input power required by the motor 2 will change and fluctuate in real time, and the power distribution frequency of the power distribution switch 5 is generally low, and it cannot respond to the changes in the input power demand of the motor 2 in time. Therefore, the battery 3 is also controlled to power the motor 2 in time to make up for the power fluctuation difference, thereby ensuring stability and safety during the operation. Embodiment 2

[0026] This embodiment provides a charging power distribution method. This embodiment is optimized on the basis of the first embodiment to improve the technical effect and refine the technical solution. For the contents not fully described in this embodiment, please refer to the first embodiment.

[0027] As one embodiment, the historical power data of the motor 2 can be indirectly obtained through the physical data of the vehicle operation. Specifically, the torque and speed of the motor 2 are obtained, and the reference power value is calculated according to the following formula: , In the formula, is the reference power value, is the torque, The reference power value of at least one working cycle is continuously recorded as historical power data. Taking an excavator as an example, a working cycle can be the time for excavating a standard working surface.

[0028] As one embodiment, the first power value is the peak power to cover the power demand of the motor 2 in most cases, and the second power value is the average power to cover the basic power demand of the motor 2.

[0029] A large number of experiments and statistics show that a first threshold of about 20% is more appropriate.

[0030] Compared with the first embodiment, the charging power distribution method provided in this embodiment solves the method of obtaining the historical power data of the motor 2, sets reasonable values ​​of the first power value, the second power value and the first threshold value, and further improves the safety and stability of the on-load charging of the electric engineering machinery. Embodiment 3

[0031] refer to Figure 2 , Figure 3 and Figure 4 , this embodiment provides a vehicle charging system, including, The vehicle controller 1 is used to execute the charging power distribution method provided in embodiment 1 or 2, and has functional modules and beneficial effects corresponding to the execution method. The vehicle charging system provided in this embodiment has the same technical effects as those in embodiment 1 or 2, which will not be repeated here. Embodiment 4

[0032] This embodiment provides a vehicle-mounted charging system, which is optimized on the basis of the third embodiment to improve the technical effect and refine the technical solution. For details not fully described in this embodiment, please refer to the third embodiment.

[0033] As one embodiment, the vehicle charging system further includes a motor 2 and a battery 3; and a power distribution switch 5, which is electrically connected to the vehicle controller 1, and is also electrically connected to the power supply, the motor 2 and the battery 3 respectively. The vehicle controller 1 sends the power distribution strategy to the power distribution switch 5, and the power distribution switch 5 coordinates the charging power from the power supply and distributes it to the motor 2 and the battery 3; And the battery management device 6 is connected to the vehicle controller 1 via electrical signals. The vehicle controller 1 sends the power allocation strategy to the battery management device 6, and the battery management device 6 controls the charging and discharging of the battery 3 accordingly.

[0034] The vehicle charging system provided in this embodiment has at least three modes: On-load charging mode, refer to Figure 1 , Figure 2 And the charging power allocation method provided in embodiments 1 and 2; Pure charging mode, reference Figure 3 , the motor 2 is turned off, the vehicle controller 1 sends a pure charging power distribution strategy to the power distribution switch 5, and the power distribution switch 5 distributes all the charging power to the battery 3 for charging; Stop mode, see Figure 4 , there is no power input, the charging power is zero, and the motor 2 is completely powered by the battery 3.

[0035] It is worth noting that Figure 2 , Figure 3 and Figure 4 In the figure, the dotted line is the model control line, and the solid line is the power supply line.

[0036] Therefore, the vehicle charging system provided in this embodiment can meet various power usage modes and adapt to the needs of different stages.

[0037] As one example, refer to Figure 2 and Figure 3 The power source is an on-board charger 4, which is electrically connected to a power distribution switch 5. The on-board charger 4 is used to rectify external AC power into DC power to supply the power distribution switch 5. The DC power meets the fast charging requirements of the battery 3.

[0038] As one example, refer to Figure 2 , Figure 3 and Figure 4 The vehicle charging system also includes a motor controller 7, which is electrically connected to the power distribution switch 5 and the motor 2 respectively, and the motor controller 7 is electrically connected to the control device and the vehicle controller 1 respectively; the motor controller 7 controls the actual input power of the motor 2 according to the charging power distribution strategy of the vehicle controller 1 and the control instructions of the control device. Embodiment 5

[0039] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the charging power allocation method provided in Embodiment 1 or Embodiment 2 are implemented.

[0040] The computer-readable storage medium provided in this embodiment has the same technical effects as those in Embodiment 1 or 2, and will not be described in detail here. Embodiment 6

[0041] This embodiment provides a computer program product, on which a computer program is stored, and when the program is executed by a processor, the steps of the charging power allocation method provided in Embodiment 1 or Embodiment 2 are implemented. The computer program product provided in this embodiment can be transmitted, distributed and downloaded in the form of a signal via the Internet.

[0042] The computer program product provided in this embodiment has the same technical effects as those in Embodiment 1 or 2, and will not be described in detail here.

[0043] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0044] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0045] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0046] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0047] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A charging power distribution method, characterized in that: include, Acquiring historical power data of the motor (2), and extracting a first power value and a second power value lower than the first power value from the historical power data; Obtaining the power status value of the battery (3) in real time; In response to the state of charge value being less than a first threshold, the battery (3) is disconnected from supplying power to the motor (2), a first power value is allocated from the charging power to supply power to the motor (2), and the remaining power is allocated to the battery (3) for charging; In response to the state of charge value reaching a first threshold, a second power value is allocated from the charging power to power the motor (2), and the remaining power is allocated to the battery (3) for charging; and the battery (3) is controlled to power the motor (2) to compensate for the power fluctuation difference.

2. The charging power distribution method according to claim 1, characterized in that: The obtaining of historical power data of the motor (2) includes: The torque and speed of the motor (2) are obtained, and a reference power value is calculated according to the following formula: ， In the formula, is the reference power value, is the torque, is the rotation speed; The reference power value of at least one working cycle is continuously recorded as historical power data.

3. The charging power distribution method according to claim 1, characterized in that: The first power value is peak power, and the second power value is average power.

4. The charging power distribution method according to claim 1, characterized in that: The first threshold is 20%.

5. A vehicle charging system, characterized in that: include, A vehicle controller (1) for executing the charging power distribution method according to any one of claims 1 to 4.

6. The vehicle-mounted charging system according to claim 5, characterized in that: Also includes, Motor (2) and battery (3); A power distribution switch (5) is electrically connected to the vehicle controller (1) and is also electrically connected to a power source, the motor (2) and the battery (3); A battery management device (6) is electrically connected to the vehicle controller (1); The vehicle controller (1) adjusts the charging power distribution of the motor (2) and the battery (3) through the power distribution switch (5), and also adjusts the charging and discharging of the battery (3) through the battery management device (6).

7. The vehicle-mounted charging system according to claim 6, characterized in that: The power source is an on-board charger (4), the on-board charger (4) is electrically connected to the power distribution switch (5), and the on-board charger (4) is used to rectify external alternating current into direct current to supply the power distribution switch (5).

8. The vehicle-mounted charging system according to claim 6, characterized in that: The vehicle further comprises a motor controller (7), wherein the motor controller (7) is electrically connected to the power distribution switch (5) and the motor (2), respectively, and the motor controller (7) is electrically connected to the control device and the vehicle controller (1), respectively; the motor controller (7) controls the actual input power of the motor (2) according to the charging power distribution strategy of the vehicle controller (1) and the control instruction of the control device.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the charging power allocation method described in any one of claims 1 to 4 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the charging power allocation method described in any one of claims 1 to 4 are implemented.

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